For BPs... it really depends on the individual snake. I have one female I absolutely cannot keep outside of a tub. She'll stress out and strike at the glass or acrylic any time she sees something move.
I had a male who would regularly come out in the evening and do a brief wander. Usually 3-4 nights a week if he wasn't in a shed cycle. Climbing, doing the corner dance...just fun to watch.
I think the easiest way to get started is a smaller tub setup with a hatchling. From there, you can learn the habits and get the feeding schedule down.... the baby gets used to all the strange scents and sounds. If it's a more outgoing and curious baby and not as balled up during outings after they're settled.... consider trying a larger setup. If they're still very shy, they may be the type that does better with a dark tub.
It's really refreshing to see someone who is more concerned about the actual wants and needs of the animal over their personal ones.... so thank you for that!
I know of someone who actually keeps a motion activated camera set up with their snake so they can see what they get up to at night. Maybe something to consider for yours as well! Get an idea of how comfortable and active they are,
I know once I finally get the okay and clearance for a larger display setup again, that's what I'm planning on doing with mine. Hahah.